<template>
	<view class="searchLayout">
		<view class="search">
			<uni-search-bar 
			@confirm="onSearch"
			@cancel="onClear"
			@clear="onClear"
			focus 
			placeholder="搜索"
			v-model="queryParams.keyword">
			</uni-search-bar>
		</view>
		
		
		<view v-if="!classList.length || noSearch">
			<view class="history" v-if="historySearch.length">
				<view class="topTitle">
					<view class="text">最近搜索</view>
					<view class="icon" @click="removeHistory">
						<uni-icons type="trash" size="25"></uni-icons>
					</view>
				</view>
				<view class="tabs">
					<view class="tab" v-for="tab in historySearch" :key="tab" @click="clickTab(tab)">{{tab}}</view>		
				</view>
			</view>
			
			<view class="recommend">
				<view class="topTitle">
					<view class="text">热门搜索</view>				
				</view>
				<view class="tabs">				
					<view class="tab" v-for="tab in recommendList" :key="tab" @click="clickTab(tab)">{{tab}}</view>
				</view>
			</view>
		</view>
		
		
		<view class="noSearch" v-if="noSearch">
			<!-- 从插件市场下载的 当没有搜索结果时显示的空状态 -->
			<uv-empty mode="search" icon="http://cdn.uviewui.com/uview/empty/search.png"></uv-empty>
		</view>
		
		
		<view v-else>
			<view class="list">
				<navigator :url="`/pages/previw/previw?id=${item._id}`"  class="item" 
				v-for="item in classList" :key="item._id">				
					<image :src="item.smallPicurl" mode="aspectFill"></image>				
				</navigator>
			</view>
			<!-- 判断是否有加载更多或者没有数据了的提示 -->		
			<view class="loadingLayout" v-if="noData || classList.length">
				<uni-load-more :status="noData?'noMore':'loading'"/>
			</view>
		</view>
		
		
	</view>
</template>

<script setup>
import {ref} from "vue";
import {onLoad,onUnload,onReachBottom} from "@dcloudio/uni-app";
import { apiSearchWall } from "@/api/apis.js"

//查询参数
const queryParams = ref({	
	pageNum:1,
	pageSize:12,
	keyword:""
})

//搜索历史词(历史记录需要放到缓存里)
const historySearch = ref(uni.getStorageSync("historySearch") || []);

//热门搜索词
const recommendList = ref(["美女","帅哥","宠物","卡通"]);

//没有更多
const noData = ref(false);
//没有搜索结果
const noSearch = ref(false);

//搜索结果列表
const classList = ref([]);


//点击搜索
const onSearch = ()=>{
	uni.showLoading()
	// 将每次的搜索进行数组的添加，queryParams.value.keyword 新内容在前，旧内容在后，new Set去重，然后展开运算符换成数组
	historySearch.value = [...new Set([queryParams.value.keyword, ...historySearch.value]) ].slice(0,9)
	uni.setStorageSync("historySearch", historySearch.value)
	initParmise(queryParams.value.keyword)
	searchData()
}

// 搜索发送请求
const searchData = async() => {
	try{
		let res = await apiSearchWall(queryParams.value)
		if(queryParams.value.pageSize > res.data.length){
			// 判断下拉刷新是否还有新数据
			noData.value = true
		}
		if (res.data.length == 0 && classList.value.length == 0) noSearch.value = true
		classList.value = [...classList.value,...res.data]
		uni.setStorageSync("storageClassList",classList.value)
	}finally{
		uni.hideLoading()
	}
	
}

// 初始化 ：因为如果点击不同的标签 就应该先清除一波然后在进行填充
const initParmise = (value='')=> {
	classList.value = [];
	noData.value = false;
	noSearch.value = false;
	queryParams.value = {
		pageNum:1,
		pageSize:12,
		keyword: value
	}
}

//点击清除按钮
const onClear = ()=>{
	initParmise()
}


//点击标签进行搜索
const clickTab = (value)=>{
	initParmise(value)
	onSearch()
}

//点击清空搜索记录
const removeHistory = ()=>{
	uni.showModal({
		title:"是否清空历史搜索？",
		success:res=>{
			if(res.confirm){
				uni.removeStorageSync("historySearch")
				historySearch.value = []
			}
		}
	})
}

//触底加载更多
onReachBottom(()=>{
	if(noData.value) return
	queryParams.value.pageNum++
	searchData()
})

//关闭有页面
onUnload(()=>{
	uni.removeStorageSync("storageClassList")
})


</script>

<style lang="scss" scoped>
.searchLayout{
	.search{
		padding:0 10rpx;
	}
	.topTitle{
		display: flex;
		justify-content: space-between;
		align-items: center;
		font-size: 32rpx;
		color:#999;
	}
	.history{
		padding:30rpx;		
	}
	.recommend{
		padding:30rpx;
	}
	.tabs{
		display: flex;		
		align-items: center;
		flex-wrap: wrap;
		padding-top:20rpx;
		.tab{
			background: #F4F4F4;
			font-size: 28rpx;
			color:#333;
			padding:10rpx 28rpx;
			border-radius: 50rpx;
			margin-right: 20rpx;
			margin-top: 20rpx;
		}
	}	
	.list{
		display: grid;
		grid-template-columns: repeat(3,1fr);
		gap: 5rpx;
		padding:20rpx 5rpx;		
		.item{
			height: 440rpx;
			image{
				width: 100%;
				height: 100%;
				display: block;
			}			
		}		
	}
}
</style>